215/40 R18 - Best tyres 2025 - market overview, tests, reviews

215/40 R18 doesn't belong to the most popular dimensions for tyres - there are tyre models available, which can be compared to 325/30 R21, 155/60 R15, 155/65 R13. Let's break down the sizing - 40 is height of the tyre, which is calculated as 40% of the tyre width (215mm), which means the sidewall height has 86 mm. The wheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 235/55 R18(2248.44 mm), 235/65 R18(2396.09 mm), 155/70 R19(2197.86 mm), 245/35 R21(2214.51 mm), 165/60 R15(1818.98 mm), 245/45 R19(2208.85 mm), 170/80 R15(2051.46 mm). You can find 215/40 R18 on 9 car models - mainly Alfa Romeo, Hyundai, Alpine, Audi, BMW.